I’m unsure to understand what you mean by "“intellectually”. Yet, according to the warrior path, I think you have to be disciplined and persevering. Then I found that most of the very good LD’ers will finally end up in practicing meditation.
I don’t really agree with Castaneda’s “inorganic beings” theory. I know some people who practise LD’ing for a long time and they don’t confirm this. But people who have read Castaneda generally have the most terrible lucid nightmares, cause they are afraid of LD’ing, and when you are afraid, you have nightmares. I’ve two examples : a friend of mine was so afraid that he stopped LD’ing. Three years later, after having read other LD’ing accounts, he realized that what he believed real was only the projection of his fears. He decided to start again and had no more problem. Somebody whom I’ve read the DJ related that he has read Castaneda and when he practised LD’ing, he had lucid nightmares: he believed the dream characters were “real”, tried to wake up from his LD’s, what provoked sleep paralysis (and of course it was even worse, etc.) One day, he found Flo’s LD’ing journal on the web, he mailed her and she told him he has not to be afraid cause DC’s were not real. From this day, he had no more problem. The same trouble can also happen to people who believe in astral entities. Moreover, tibetan buddhist books about lucid dreaming don’t mention this problem. So, as for me, I think there is no danger.
The best Castaneda’s books are “Separate Reality”, “Journey to Ixtlan”, “Tales of power”, “The second ring of power”, “The eagle’s gift”, “Fire from within”, and “The power of silence”. I don’t like his other books. You have to read them all, at least from “Journey to Ixtlan” to “The power of silence” because the concepts are developped in each books in a newer and larger way. There are many other books by other authors which have been written about Castaneda’s warrior path, but they are far less good.
It’s in the Lucid Wikibook. I don’t agree with that. It may happen if you already have mental trouble. Yet some people are schizophrenic on the forum and LD’ing seems not to create trouble.
As I said above, a bigger problem, IMO, may happen if you believe in the reality of dream characters. This may lead to some slight form of paranoïa (but not irreversible). People who are subject to sleep paralysis may face exactly the same problem indeed if they believe they are abducted by aliens, visited by demons, etc. These cases are more common than dissociation, which I never heard about… with the exception of the wikibook.
My best wishes on your path.